I've been trying to config two of these as described here

http://www.peter2000.co.uk/ix104/index.html

but cannot get the RIM 1802g modem to work at all. I've tried to talk
to it with Hyperterminal and that doesn't work either; there is not
even a response to AT<CR>.

It is possible that the modem isn't getting any power; I wonder if
there is some extra software config to enable that?

Any suggestions would be much appreciated.


Peter.
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Peter wrote:
> I've been trying to config two of these as described here
>
> http://www.peter2000.co.uk/ix104/index.html
>
> but cannot get the RIM 1802g modem to work at all. I've tried to talk
> to it with Hyperterminal and that doesn't work either; there is not
> even a response to AT<CR>.
>
> It is possible that the modem isn't getting any power; I wonder if
> there is some extra software config to enable that?
>
> Any suggestions would be much appreciated.

You may have already done this, but, the most obvious thing to do would
be to check the signal on the ONI/ENABLE/CS/etc pin on the modem. You
should check the instruction sheets, but IIRC a logic high on that pin
would mean it will be switched on. There's another pin that outputs the
current state of the modem (running or off).

On your site you wrote you measured 4V on the modem supply, so i'd
assume you can run the tabletpc opened up?

Then it's easy to measure the voltage on the enable-pin. If it indicates
"off" and you don't have the required software nor bios access to enable
the modem, you could just simply hard-wire that pin to the supply
voltage. I.e. cut out the corresponding lead in the cable, then connect
(solder directly, or new wire) the modem side end of it to the modem's
supply pin. It's "safe" to do this as by now your tabletpc has lost any
warranty it might have had, anyway... ;-)))

good luck,
- Jan